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    <title>fourplan</title>
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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>fourplan</b> -  augmented plant to four plants</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[P11,P12,P21,P22]=fourplan(P,r)  </tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>P</b>
        </tt>: <tt>
          <b>syslin</b>
        </tt> list (linear system)</li>
      <li>
        <tt>
          <b>r</b>
        </tt>: 1x2 row vector, dimension of <tt>
          <b>P22</b>
        </tt>
      </li>
      <li>
        <tt>
          <b>P11,P12,P21,P22</b>
        </tt>: <tt>
          <b>syslin</b>
        </tt> lists.</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    Utility function.</p>
    <p>
      <tt>
        <b>P</b>
      </tt> being partitioned as follows:</p>
    <pre>

P=[ P11 P12;
    P21 P22]  
   
    </pre>
    <p>
    with <tt>
        <b>size(P22)=r</b>
      </tt> this function returns the four linear systems <tt>
        <b>P11,P12,P21,P22</b>
      </tt>.</p>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="../control/lqg.htm">
        <tt>
          <b>lqg</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="../control/lqg2stan.htm">
        <tt>
          <b>lqg2stan</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="../control/lqr.htm">
        <tt>
          <b>lqr</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="../control/lqe.htm">
        <tt>
          <b>lqe</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="lft.htm">
        <tt>
          <b>lft</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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